Not sure if this has been posted elsewhere on Wilders, my most profound apologies if it has....

About this Add-on
gui:config makes it easier to change preferences that can only be found in the “about:config”. The extension supports a comfortable way to apply changes to these options. It displays the options, included in the current version, using checkboxes, dropdownlists and textboxes.

For a short introduction go to http:-//blog.freedig.org-/guiconfig-first-steps